Checking there, it looks like in 2009, sunrise aligns with the grid on April 17 or 18, and August 23 or 24; and sunset on February 16 or 17, and October 23 or 24. ("N or N+1" in all cases since both the reference for the angle of the grid and the azimuth are only given to the nearest degree. More precision would be needed in those angles for the exact answer.)